Unlike most annual crops, the roots of long-lived trees can penetrate through soils to great depth to reach water (Figure 1). If we can’t tell how deeply roots penetrate, how do we determine when trees run out of water? One way is to monitor the...

This week, more than 193 nations will celebrate Earth Day. The annual event is a marker for the environmental movement begun on April 22, 1970, when Wisconsin Sen. Gaylord Nelson organized a peaceful teach-in. At the time, rivers were on fire, oil spills...

I began my career as forest ecologist in the 1990s, cataloging the remarkable web-of-life in the old-growth rainforests of Prince of Wales Island. Since then, I have worked with rainforest ecologists around the world to document exceptional places like...